Sexually Transmitted Infections and First Sexual Intercourse Age in Adolescents: The Nationwide Retrospective Cross-Sectional Study

Authors

  • Seo Yoon Lee RN,

    1. Department of Health Policy and Management, Graduate School of Public Health, Yonsei University, Seoul, South Korea
    2. Institute of Health Services Research, Yonsei University, Seoul, South Korea
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  • Hyo Jung Lee RN, MPH,

    1. Institute of Health Services Research, Yonsei University, Seoul, South Korea
    2. Department of Public Health, Graduate School, Yonsei University, Seoul, South Korea
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  • Tae Kyoung Kim BE,

    1. Institute of Health Services Research, Yonsei University, Seoul, South Korea
    2. Department of Public Health, Graduate School, Yonsei University, Seoul, South Korea
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  • Sang Gyu Lee MD, PhD, MBA,

    1. Institute of Health Services Research, Yonsei University, Seoul, South Korea
    2. Department of Hospital Management, Graduate School of Public Health, Yonsei University, Seoul, South Korea
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  • Eun-Cheol Park MD, PhD

    Corresponding author
    1. Institute of Health Services Research, Yonsei University, Seoul, South Korea
    2. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, South Korea
    • Corresponding Author: Eun-Cheol Park, MD, PhD, Department of Preventive Medicine, College of Medicine, and Institute of Health Services Research, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 120-752, South Korea. Tel: 82-2-2228-1862; Fax: 82-2-392-8133; E-mail: ecpark@yuhs.ac

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Abstract

Introduction

Sexually transmitted infections (STIs) are major causes of medical and psychological problems globally, while adolescents in South Korea have recently shown rapid changes in sexual behaviors.

Aims

We aimed to examine the association between the age of first sexual intercourse and the experience of STIs among adolescents. Additionally, in which specific time period would more likely to get infected from sexual intercourse.

Methods

We used data from the 2007–2013 Korea Youth Risk Behavior Web-based Survey. Only adolescents with sexual intercourse experience (N = 22,381) were included, and multiple logistic regression analysis was performed.

Main Outcome Measures

One dichotomized measure and one continuous measure were assessed: (i) STIs experience (defined as having had STIs); and (ii) association between STIs experience and absolute age gap (defined as temporal differences between secondary sexual character emergence age and first sexual intercourse age).

Results

Approximately 7.4% of boys and 7.5% of girls reported had STI. For both boys and girls, the chance of experiencing STIs increased as the age of first sexual intercourse decreased (boys: before elementary school [age 7 or under]: odds ratio [OR] = 10.81, first grade [age 7 or 8]: OR = 4.44, second grade [age 8 or 9]: OR = 8.90, fourth grade [age 10 or 11]: OR = 7.20, ninth grade [age 15 or 16]: OR = 2.31; girls: before elementary school: OR = 18.09, first grade: OR = 7.26, second grade: OR = 7.12, fourth grade: OR = 8.93, ninth grade: OR = 2.74). The association between the absolute age gap and STI experience was examined additionally (boys: OR = 0.93, girls: OR = 0.87).

Conclusions

This study shows that earlier initiation of sexual intercourse increases the odds of experiencing STIs. Also as the age gap gets shorter, the odds of experiencing STIs increase. Our study suggests that it is important to consider the time period of first sexual intercourse and to reinforce a monitoring system along with the development of other preventive strategies. Lee SY, Lee HJ, Kim TK, Lee SG, and Park EC. Sexually transmitted infections and first sexual intercourse age in adolescents: the nationwide retrospective cross-sectional study. J Sex Med 2015;12:2313–2323.

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